YOU SAID:

as the school is sleeping their children called students are learning

INTO JAPANESE

学校が寝ている間、生徒と呼ばれる子供たちが学んでいます

BACK INTO ENGLISH

Children called students are learning while the school is sleeping

INTO JAPANESE

生徒と呼ばれる子供たちは学校が寝ている間に学んでいます

BACK INTO ENGLISH

Children called students are learning while the school is sleeping